Free everyday calculators

Practical online tools for common US daily tasks.

Calculate salary conversions, tips, sales tax, mortgage payments, BMI with feet and pounds, time zones, currency estimates, and more. No sign-up required.

Privacy-first file tools

Selected files stay in your browser.

Compress and convert images, prepare files for print, merge or extract PDF pages, and remove common image metadata. No account and no file upload to KokoroFlow.

Random Picker

Enter a list, or use source count for choices like 12 choose 3.

Enter options, or fill source count.

Tip Calculator

Estimate tip, total, and per-person amount for restaurants or deliveries.

Tip: $9.70 | Total: $58.20Per person: $29.10

Sales Tax Calculator

Enter a price and local tax rate to estimate the final checkout total.

Sales tax: $8.25 | Final total: $108.24

Currency Converter

Use public API reference rates when available. Rates are for reference only.

Not a live bank rate. Reference only.
Getting public API reference rate...Rates are not live bank rates.

Mortgage Calculator

Estimate a US-style monthly principal and interest payment.

Loan amount: $320,000.00 | Estimated P&I: $2,075.51 / monthTaxes, insurance, HOA, and PMI are not included.

BMI Calculator

Designed for US units: feet, inches, and pounds.

BMI: 24.3 (Normal range)

Password Generator

Generate a local random password with optional symbols and similar-character exclusion.

K}u7oGA!P;3tUj6o

Unit Converter

Common US conversions: inches, feet, miles, pounds, and metric units.

10 in = 25.4 cm

Word Counter

Count words, characters, sentences, and estimated reading time.

Words: 7 | Characters: 46 | Sentences: 1 | Reading time: about 1 min

US Time Zone Converter

Convert a time between Eastern, Central, Mountain, Pacific, Alaska, and Hawaii time.

Converted time: 6:00 AM